Otto jung



' UNITE STATES PATENT OFF CE. I

one JUNG, or JERSEY CITY, NEW JERSEY.

MACHINE'F OR GRINDING S PI-IERICAL BODIES.

SPECIFICATION forming part of Letters Patent No. 392,435, dated November'6, 1888.

Application filed February 11, 1888. Serial No. 263,723. (No model.)

T at whom it may concern:

Be it known that I, OTTO JUNG, of Jersey City, in the county of Hudsonand State of New Jersey, have invented certain new and usefulImprovements in Machines for Grinde ing Spherical Bodies, of whichthefollowing is a specification.

Thisinvention relates to an improved ma chine for grinding sphericalbodies, such as balls of metal, ivory, har'd rubber, composition,&c.,used for anti-friction bearings,valves, casters, and other purposesin which a true sphere is required. The machine is adapted for grindingdifferent sizes of spherical bodies and performsits work in a regularand speedy manner.

Theinvention consists ofa machine forgrinding spherical bodies, andcomprises a rotatory horizontal disk provided with a circular groove ordepression for the balls to be ground, and a second similarly grooveddisk that rests on the top of the walls, and means for preventing theturning of the upper disk, which means are adapted to adjust themselvesto different distances'of the top disk from the lower rotatory disk,according to the diameters of the balls to be ground off.

In the accompanying drawings, Figure 1 represents a front elevation,partly in vertical section, through the grinding-disks'of myiinprovedmachine for grinding spherical bodies. Fig. 2 is a side elevation of thesame; and Fig. 3, a plan view of the grinding-disks and a horizontalsection on line or m, Fig. 1, of the supporting-frame, part of the topgrindingdisk being broken away.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, A represents an upright supporting-frame, ofwood or other suitable material, which is attached in any suitablemanner to the wall or other upright support. To the uprightsupportingframe A are rigidly attached horizontal bracket-arms B B,which carry vertical adjustable set-screws b 12, havingconically-tapering points, said setscrews being retained by screw-nutsb. The pointed set-screws b b are vertically in line with each other andsupport a vertical shaft, 0, to which rotary motion is imparted by meansof a fixed and loose pulley, dd, and a motiontransmitting belt, (notshown in the drawings,)

which is transferred from the loose to the fixed pulley by abelt-shifter, D, which is applied by suitable staples, D, to thesupportingframe B, as shown in the drawings.

To the vertical rotary shaft 0 is splined a fixed horizontal disk, E,which is provided at its upper surface with an annular groove, 6,preferably of V-shaped cross-section, in which the balls a to be groundare placed close together, so as to be in contact with each other. Asecond disk, E, is provided with a cylindrical hub, e, through which theshaft 0 passes, so that said disk E can readily slide around the shaftwithout following the motion of the same. To the hub e of the uppergrindingdisk, E, is applied a ringsliaped retaining device, F, which ispivoted by screws h, located at diametrically-opposite points of theretaining device F to the hub e, the ring-shaped retaining device Fbeing provided at one side with an arm, F having an eye or aperture, f",into which the hook-shaped end f of a link, F, can be passed, that ispivoted to a bracketeye, 9, of the supporting-standard A, so as to swingreadily thereon as the upper grindingdisk, E, moves up or down. The linkFholds the upper grinding-disk, E, in a stationary position and preventsit from following the motion of the shaft 0 and lower grinding-disk, E,which it would otherwise do, owing to the friction exerted thereon bythe balls interposed between the grinding-disks. The uppergrinding-disk, E, is provided at its underside with a V-shaped or othergroove, 6*, vertically above the groove 6 of the lower grindingdisk, E,said grooves serving to retain and guide the balls which are interposedfor grinding between the lower rotary and upper stationary disks.

The retaining-ring F is pivoted to the hub of the upper grinding-disk,E, by means of the pointed screws h, so as to permit the adj ustment ofthe upper grindingdisk, E, to balls of different diameters withoutexerting any strain on the upper fixed grinding-disk.

The operation of the machine is as follows: Gast-meta1 or other ballsare placed in the groove 6 of thelower grindingdisk, E, so as to formcontact with each other. The upper disk is then placed in position onthe balls. Suitable abrading medium is interposed between the disks andballs and the belt applied to the fixed pulley of the driving-shaft C,so that a rapid rotary motion is imparted to the lower grinding-disk. Bythe driving action of the lower disk and the retarding action of theupper disk on the balls and the frictional contact with each other theballs are gradually ground off to a true sphere as they continuallychange their relative position to each other and the disks. \Vhen theballs are ground off to the proper diameter, they are then ready foruse.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- .1. The combination of a horizontal rotatory grindirig-disk provided with an annulargroove in its upper surface, an uppergrinding-disk having an annular groove in its lower surface verticallyabove the groove of the lower disk, and a retainer for holding the upperdisk in stationary position, so as to prevent it from Following themotion of the rotatory disk, substantially as set forth.

2. The combination ofa vertical rotary shaft,

a grinding-disk fixed on said shaft and provided with a groove in itsupper surface, asecond grinding-disk having an annular groove in itslower surface vertically above the groove of the lower disk, the upperdisk bei ng mounted loosely on the driving-shaft, a ringshaped retainingdevice pivoted to thehub of the upper disk, and a connecting-link forconnecting said retaining-ring and fixed eye, substantially as setforth.

3. The combination of an upright supporting-frame having horizontalbracket-arms, pointed set-screws supported on said bracketarms, avertical driving-shaft, means for imparting rotary motion to saiddrivingshaft, a horizontal grinding-disk fixed to said shall; andprovided with an annular groove in its upper surface, a secondgrindingdisk placed loosely on said sh aft and provided with agroovc inits under surface, aring-shaped holder pivoted to the hub of the upperdriving-disk, and a retaining-link pivotally connected to an arm of theholder and a fixed eye on the supporting-frame, substantially as setforth.

In testimony that I claim the forcgoingas my invention I have signed myname in presence of two subscribing witnesses.

()l" O .IU N G.

\Vitncsscs:

PAUL GonrnL, Joan A. Srnanm'.

